The production value of this show is fantastic, makes the HD subs worth getting. Denno Coil's style reminds me of Spirited Away (Side note: and if you haven't seen all of Hayao Miyazaki's stuff, I recommend you do; the production quality is fantastic and the English dub versions are even actually worth a damn compared to the original Japanese with subtitles)

The show has been in pre-production/development for over 10 years according to wikipedia (http://en.wikipedia.org/wiki/Dennou_Coil) and is the directorial debut of Mitsuo Iso, whose detailed key animation style can be seen in animation sequence in Kill Bill depicting the origin of O-Ren Ishi. Though the information about Mitsuo Iso's animation style does not directly apply to Denno Coil (since he is directing/creator of the series and not and animator for the series), it still gives you an idea of the kind of quality he probably demands while directing the series.

Although the first chunk of episodes are available on stage6 (http://stage6.divx.com), its better to grab the HD fansubs.

Currently the furthest along in subbing Dennou Coil is Ureshii fansubs they have subbed up to episode 12.
Home Page: http://www.ureshii-fansub.org/
Torrent Tracker: http://a.scarywater.net/ureshii/

Episode 13 is available from "Anoni" Fansubs via Anirena:
http://tracker.anirena.com/download.php?id=1668

According to ANN, a "recap episode" was released after 13 that wasn't even given a number, I hope the fansubbers brush over the recap quickly and go onto 14.

For those of you that haven't gotten there yet, wait till episode 12, its easily the best episode thus far.